Abstract
The chemical composition of fucans isolated from leach-water, an industrial alginate extraction byproduct, was investigated. Several fractions were obtained by anion exchange and gel permeation chromatography. They all contained fucose, but differed in the uronic acid, sulfate, xylose and galactose contents. They distributed as a continuum between uronic acid rich and sulfate poor to sulfate rich and uronic acid poor molecules. Two highly sulfated fractions were studied in particularly by chemical means (methylation, carboxy reduction, desulfation, controlled acid hydrolysis) and by 3 C nuclear magnetic resonance spectroscopy. One fraction consisted of a highly branched fucan (43.8% fucose) composed
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